Best electric tankless water heater for cold climates in 2022 – BestHeaterGuide

As they say, one only treasures what he doesn’t have the access to. The same can be said about a hot shower in northern states with colder weather. There is no need to describe how uncomfortable it is to take a cold shower in the winter. Hence, buying a water heater becomes a necessity. A tankless water heater is an ideal choice in this case due to its never-ending supply of hot water. As hot water is no longer a luxury but a need for the family.

While a tankless water heater is powered by propane, natural gas, and electricity. Electricity is the only fuel source that is available to everyone. So, a lot of people look for an electric tankless water heater. Which has its own perks, an electric tankless water heater has the least cost for the unit and installation compared to natural gas or propane tankless water heater. While its fuel cost is much higher than the other ones.

You should also be aware that not all tankless water heaters are capable of operating in colder temperatures. A colder climate brings a number of challenges for the tankless water heater like water freezing inside the tankless unit, icy water in pipes, decrease hot water capacity, and sizing difficulties.

Usually, an electric tankless water heater isn’t as reliable as other types during colder weather. Mainly, due to the fact that electric tankless water heaters are less powerful than gas or propane-fueled tankless unit. This also means that a cold climate will have a much more adverse effect on tankless water heater’s hot water capacity.

Quick Shopping Tips

Budget Pick

Ecosmart Eco 36 is a powerful but budget-friendly unit that is built with high-quality material and is backed by a lifetime warranty. While its efficient operations give you higher savings and a longer lifespan.

Best Pick

Stiebel Eltron Tempra 29 is the best pick in terms of the best electric tankless water heater for colder climates as it is powerful enough to support all your needs while ensuring a maximum user-friendly experience. Its advanced flow control won’t let you experience a cold water sandwich while its quiet operation gives you the peace you need.

Staff Pick

Stiebel Eltron Tempra 24 is a great choice for a colder climate if your hot water needs are not too excessive. It is a powerful unit that does not have much higher requirements for electrical services like its other alternatives. While its advanced features give you the best user experience.

At a Glance:

Our recomendation for 10 best electric tankless water heater for cold climates

An electric tankless water heater can combat frost but it is limited by some factors. One of the major factors is power. If in case the breaker does ever trip, the tankless unit won’t continue to work until it is reset. Making it shut down, hence no power will flow through the tankless system. Such a tankless water heater cannot deal with the freezing temperature. If nothing is done in such a case, it may result in freezing of water flowing through the tankless unit which may deal permanent damage to the tankless unit. On the other hand, when a tankless water heater is in operation the heat of the heat exchanger helps to fight against frost for a small period of time corresponding to the time of operation.

Despite these setbacks, having an electric tankless water heater can be a great choice for colder climates. If you’re looking for a heater that provides the most reliability in colder temperatures, we have compiled a list of the best electric tankless water heater for cold climates.

DesignTankless heater reviewsRetailer
1. Rheem RETEX-36 KW  Electric Tankless Water Heater
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Budget Pick2. Ecosmart ECO-36 KW  Electric Tankless Water Heater
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3. SioGreen SIO 18 Electric Tankless Water Heater (Best for Hard Water problems)
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Staff Pick4. Stiebel Eltron Tempra 24 plus Electric Tankless Water Heater
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5. Atmor 29kW Electric Tankless Water Heater
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6.    Iheat Electric Tankless Water Heater
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7. Ecosmart ECO 11 Electric Tankless Water Heater
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Best Pick8. Stiebel Eltron Tempra 29 plus Electric Tankless Water Heater
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9. Thermomate 18KW Electric Tankless Water Heater
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10. Rheem RTEX-13 Electric Tankless Water Heater
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1. Rheem RETEX-36 KW Electric Tankless Water Heater

Rheem RETEX-36 KW tankless water heater
Rheem RETEX-36 KW tankless water heater

The Rheem RTEX-36 KW tankless water heater is a whole house tankless water heater that provides a superior warranty and enhanced temperature control. It is an on-demand, energy-efficient, and compact way to enjoy endless hot water. The Rheem RTEX-36 KW tankless water heater features robust copper immersion heating elements which allow quicker temperature rise and enhanced efficiency with a brass top which increases durability. You may change the temperature in 1°F increments by pressing a button. The digital temperature display allows you to easily monitor your water temperature.

All these features coupled with self-modulating technology make it excellent for any household. However, if you are installing it in a colder climate be sure to install it indoors at a warm place. You also have to be prepared to get a reduced hot water capacity due to the larger difference between incoming and desired temperatures.

FEATURES:

Simple Installation:

This water heater is simple to set up and does not necessitate the use of professional services. Rheem provides a detailed manual with pictures which makes it easy for any skilled person to understand and follow. Indoor installation is advised for colder climates to avoid damage from extreme weather.

Copper Immersed Heating Elements

This water heater has copper-clad, tubular heating elements which are long-lasting and energy-efficient.

Compact Design

Rheem RTEX-36 KW tankless water heater is a compact device with a small size that saves space and conveniently fits in any home’s environment.

Self-modulation Capacity

This water heater self-modulates automatically to ensure you always have hot water on demand while maintaining your ideal set temperature and ensuring the highest possible energy savings.

1-degree temperature control

Rheem RTEX-36 KW tankless water heater features an external digital thermostatic dial controller with an LED display. This allows you to adjust the desired temperature settings in increments of one degree Fahrenheit.

Warranty:

Rheem RTEX-36 comes with an industry-leading 5-year warranty on the heat exchanger and a 1 year, limited parts-only warranty.

Certification:

WQA lead-free certified, ETL listed to CSA and UL499

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Operating pressure is 25-150 Psi
  • Voltage demand is 240v
  • Activation flow rate is 0.3 GPM
  • Recommended wire size is 8 AWG (4 wires required for 4 heating element)
  • 4 breakers of 40A required to be installed with each wire connecting to heating element
  • Water connection supports ¾ in. NPT
  • Power consumption is 36KW
  • Amp drawn is 150A

Specifications

  • Color: Silver
  • Weight: 1 pound
  • Dimensions: 6 x 3.7 x 9.2 inches

Pros

  • 8 GPM Capacity
  • Energy Efficiency of 99.8%
  • 4 copper immersion heating elements
  • Self-modulation

Cons

  • Flow rate can reduce to 3.5 Gallon in northern colder climates

Why you should buy this?

Rheem is a brand you can trust. Especially if you have ever purchased a water heater or have look for one it is a name that will always come up. So, if you want a reliable and high quality product, Rheem is the one to look for, where Rtex-36 is their most powerful and advance electric tankless water heater.


2. Ecosmart ECO-36 KW Electric Tankless Water Heater

Budget Pick

Ecosmart ECO 36 Electric Tankless Water Heater
Ecosmart ECO 36 Electric Tankless Water Heater

EcoSmart ECO 36 is a combination of advanced technology and aesthetic styling. The 9 GPM flow rate with 4 copper heating elements provides the best performance for your bathroom. Its aesthetic design complements your house decor. The digital temperature interface makes it easy to use and install. You can also customize the temperature range from 60F to 140F by yourself according to your preference. It has a lifetime warranty that is available to you upon professional installation and regular maintenance. All these features make it a reliable and trustworthy investment for the unforeseen circumstances of the future.

FEATURES

Copper heating element

EcoSmart ECO 36 tankless water heater comes with four copper heating elements. Each copper element requires 9 KW totaling 36 KW. The copper heating element provides more power and heats the water faster than the regular models. This gives ECO 36 enough power to heat 8.8 gallons of hot water capacity.

Self-modulation

EcoSmart ECO 36 is a high-performance water heater and has the most advanced technology in its class. It features Self Modulation which automatically adjusts and matches power with required hot water demands and keeps it at maximum efficiency.

Space-saving, compact and aesthetic design

EcoSmart ECO 36 comes in a compact and sleek design making it simple to add to any space. It is also an attractive-looking appliance that will blend effortlessly with your residential décor. It is designed to be ultra-compact and space-efficient, allowing you the freedom to fit the tankless water heater into your home.

Easier installation and temperature dial controls

EcoSmart ECO 36 comes with quick connect capability which makes it easier for installation. It has temperature dial controls for simple and convenient adjustment of temperature.

Lifetime Warranty

Another exclusive feature of EcoSmart ECO 36 is its Lifetime warranty on the heat exchangers. However, it is not without strings attached. It requires you to do a professional installation and follow your maintenance schedule.

Certified

WQA, NSF, CSA, and ETL Listed.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Heat exchanger is made of copper
  • Voltage demand is 240 volts
  • Power consumption is 150A
  • 4 wires of 8 AWG cables
  • 4 Breakers of 40A Double pole
  • Water fittings support ¾ NPT
  • Operating pressure of 25-150 Psi
  • Activation Flow Rate of 0.3 GPM

Specifications

  • Color: white
  • Weight: 17.4 pounds
  • Dimensions: 17H x 21W x 3.75D in inches

Pros

  • High hot water output
  • Durable construction
  • Lifetime warranty
  • Greater energy savings

Cons

  • Place a heavy burden on your house electrical service.

Why you should buy this?

Ecosmart Eco 36 is a strong tankless water heater with a lifetime warranty, making it the safest option. But it doesn’t just end there; it got tons of advance features and high hot water capacity. It is a most budget friendly unit for people with large family.


3. SioGreen SIO 18 Electric Tankless Water Heater (Best for Hard Water problems)

SioGreen SIO 18 Infrared Electric Tankless Water Heater
SioGreen SIO 18 Infrared Electric Tankless Water Heater

SIO 18 tankless water heater is powered by electricity. It works as a point-of-use tankless water heater in a colder climate. Its Hot water capacity is sufficient to support one Showerhead even in really cold climates. You can use multiple SioGreen SIO 18 tankless water heaters for your home in order to meet all your hot water needs.

It is a great choice your locality has hard water. Technically, hard water is the Nemesis of a tankless water heater because it is rich in minerals that get separated upon heating. These separated minerals then get deposited on the heating elements of a tankless water heater. Which in turn decreases its energy efficiency and can also lead to corrosion.

That’s where you need to do the periodic maintenance of the tankless water heater at regular intervals. This ensures that there is no scalp deposit remaining in the tankless water heater ensuring its highest efficiency with the highest energy savings.

Feature:

Self-Cleaning Design

The SIO 18 Tankless water heater is designed with a self-cleaning feature. This ensures that any scale or sediment that forms on the heating elements is easily cleaned off with use. This also prolongs the life of the unit, making it a wise investment.

Overheat and Anti-Scald protection

The SIO 18 Tankless water heater comes with a reliable overheat protection system so that the unit will shut off immediately if the temperature of the water reaches a certain level. Similarly, it also prevents the water from reaching a scalding temperature.

Self-Modulation

The SIO 18 Tankless water heater features self-modulation, which means that it will automatically adjust its heating output according to the needs of your household. This results in energy savings and a longer lifespan for the unit.

Eco-friendly and Space-Saving Design

The SIO 18 Tankless water heater offers an eco-friendly, space-saving design that will blend well with the décor of your home. This helps you to save on energy and provides hot water quickly for all your household needs.

Warranty

One-year warranty on the tankless unit.

Certified

This unit is certified with MET(US) and WRAS

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 220 Volt
  • Water connection fittings of 3/4 in. NPT
  • Operating pressure of 15-150 Psi
  • Activation Flow Rate of 0.5 GPM
  • Output power is 18K watts
  • Recommended electrical service is 200 AMP
  • Requires 2 breakers of 40A each
  • Wiring uses two 8 AWG wires

Specifications

  • Color: white
  • Weight: 27 pounds
  • Dimensions: 20 H x 14 W x 6 D in inches

Pros

  • Saves money and energy with self-modulation
  • Eco-friendly and space saving design
  • Reliable overheat protection
  • Self-cleaning feature keeps heating elements clean

Cons

  • Limited output makes it more of a point-of-use tankless unit in colder climates.

Why you should buy this?

Sometimes cold climate isn’t the only problem people face, another common problem is hard water which leads to scale deposit and can decrease the lifespan of your tankless unit. Here, bigger unit may not be best one. Siogreen SIO18 is the best for such circumstances.


4. Stiebel Eltron Tempra 24 plus Electric Tankless Water Heater

Staff Pick

Stiebel Eltron Tankless Water Heater
Stiebel Eltron Tankless Water Heater

Tempra 24 Plus is the most loved tankless water heater by Stiebel Eltron. It is ideal for families of 2-4 persons. The Tempra 24 Plus heats water on demand, so you’ll never have to worry about running out of hot water again. This energy-efficient water heater also features an automatic modulation system and a digital display. Plus, it comes with a 5-year warranty. Tempra 24 is an excellent choice if you need a dependable and efficient tankless water heater.

Feature:

Advanced Flow Control

It is an exclusive feature of the Tempra Plus that helps to provide a more consistent flow of hot water by measuring and controlling the water temperature at the outlet. This prevents fluctuations in temperature, which can occur when multiple people are using hot water at the same time.

Automatic Modulation

This tankless water heater features an automatic modulation system, which ensures that the water heater produces only the amount of heat needed to meet demand. Saving both energy and extending the lifespan of the unit.

Digital Display

The Tempra 24 Plus’ digital display makes monitoring and adjusting the water temperature a breeze.

Quiet

The Tempra 24 Plus has hydraulic operations which makes it virtually noiseless.

Durable build

The Tempra 24 Plus has a solid build that can withstand both cold and hot climates. Which means you can use it in any part of the country.

Warranty

This unit is accompanied by a 7-year leakage and a 3-year parts warranty.

Certified

ETL listed to UL499. Conforms to CSA guidelines, and WQA certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 240 Volt
  • Water connection fittings of 3/4 in. NPT
  • Operating pressure of 30-150 Psi
  • Activation Flow Rate of 0.5 GPM
  • Output power is 24K watts
  • Amperage drawn is 100A
  • Requires 2 breakers of 50A each
  • Wiring uses two 6 AWG wires

Specifications

  • Color: Grey Metal
  • Weight: 16.1 pounds
  • Dimensions: 16.6W x 14.5 H x 4.6 D in inches

Pros

  • Quiet operation
  • No more cold water sandwich due to advance flow control
  • Inexpensive
  • User-friendly

Cons

  • Due to high Activation flow rate of 0.5 GPM, lower water use like sink may not activate the tankless unit.

Why you should buy this?

If you want uninterrupted shower without running into cold water than this tankless water heater is the one for you. It is for small and medium size families.


5. Atmor 29kW Electric Tankless Water Heater

Atmor 18kW 3.73 GPM Electric Tankless Water Heater
Atmor 18kW 3.73 GPM Electric Tankless Water Heater

The Atmor 29kW Electric Tankless Water Heater is a high-efficiency water heater that can provide ample hot water for your home. It’s a good choice for families or anyone who consumes a lot of hot water or lives in a colder region. Additionally, it is Energy Star certified, ensuring that it is energy efficient. The Atmor 29kW Electric Tankless Water Heater is also fitted with self-modulation technology that allows it to conserve energy and use it only when needed.

Features:

Digital temperature control

Its digital temperature control makes it easy to use and adjust for your convenience. Allowing you to change the desired temperature in 1 degree.

Self-modulation:

It’s fitted with self-modulation technology that automatically adjusts temperature output depending on the amount of hot water being demanded to ensure efficient energy utilization.

Robust build:

Makes Atmor 29kW Electric Tankless Water Heater more reliable and enduring with its robust built. This also makes it easy to maintain and has a longer lifespan.

Warranty

It also comes with a 7-year leakage and 3-year parts warranty which guarantees that the water heater will be free from defects.

Certified

ETL listed to UL499, Conforms to CSA guidelines, and WQA certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 240 Volt
  • Water connection fittings of 3/4 in. NPT
  • Operating pressure of 30-150 Psi
  • Activation Flow Rate of 0.77 GPM
  • Output power is 28.8K watts
  • Amperage drawn is 120A
  • Requires 3 breakers of 40A each
  • Wiring uses three 8 AWG wires

Specifications

  • Color: Grey Metal
  • Weight: 19 pounds
  • Dimensions: 16.6W x 14.5H x 4.6D in inches

Pros

  • User friendly
  • Inexpensive
  • Self-Modulation
  • Robust build

Cons

  • Not so much of an appealing design

Why you should buy this?

It is budget friendly and robust unit that gets its work done. If it’s bland design is not much of a problem for you, it is a great choice due to its lower price but high hot water output.


6.    Iheat Electric Tankless Water Heater

iHeat Tankless S-9 240V 39A 9KW Stainless Steel Enclosure Electric Water Heater
iHeat Tankless S-9 240V 39A 9KW Stainless Steel Enclosure Electric Water Heater

If you’re looking for a tankless water heater that can provide your home with endless hot water, the Iheat tankless water heater is a perfect choice. However, this tankless unit can only work as a POU tankless water heater in colder climates.  It provides a flow rate of 3.5 GPM and saves you up to 60% on your water heating bill. While its waterproof control pad design means that it won’t have any problems even when exposed to water splashes. Its stainless steel build gives it a sturdy structure and a longer lifespan.

Features:

Stainless steel build

Iheat tankless unit is enclosed in stainless steel cover which gives it a solid and long-lasting build. It also prevents damage to the unit from the external environment

Waterproof control pad design

The control pad is designed to be waterproof, meaning that even if water splashes onto it, there will be no problems. This also gives extra protection to the electronic components of the tankless unit.

Hot Water Output

Temperature rise30F45F60F75F
Flow Rate (in GPM)3.52.51.91.5

Warranty

 There is a limited warranty on this tankless water heater. While it offers a warranty on components for three years and one year warranty on heating elements. And if there are any leaks in the tankless unit, it will be covered for 5 years. This provides you with additional peace of mind while purchasing this item.

Certified

CSA certified,

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 240v
  • Power is 16KW
  • AMP demand is 66 AMP
  • Activation flow rate is 0.5 GPM
  • Water connections are compatible with ½ CPT
  • Operating pressure of 25-150 Psi
  • Requires 2 wires of 6 AWG for Electrical connections

Specifications

  • Color: white
  • Weight:8 pounds
  • Dimensions: 11.5H x 7.7 W x 3.5 D in inches

Pros

  • Higher savings up to 60% of water heater cost
  • Stainless steel build
  • IFlow technology
  • Portable tankless water heater

Cons

  • Limited power, can only support a single outlet in colder climate

Why you should buy this?

A tankless water heater strongest build that can face against harshest of environment thanks to its stainless steel build and water proof control pad. Not to mention it is portable, so you can move it as you desire.


7. Ecosmart ECO 11 Electric Tankless Water Heater

EcoSmart ECO 11 Electric Tankless Water Heater
EcoSmart ECO 11 Electric Tankless Water Heater

The Ecosmart ECO 11 electric tankless water heater is the perfect choice for those who are looking for an energy-efficient and cost-effective way to heat their water. It is also why it is so loved by its customers. ECO 11 is a moderately powered tankless unit and can act as a point-of-use in colder climates. This is a lucrative tankless unit due to many of its advanced features like self-modulation and precise temperature control. While its lifetime warranty makes purchasing it a no-brainer.

Features:

Durable copper heat exchanger

Ecosmart ECO 11 comes with a durable copper heat exchanger that makes it durable and resistant to corrosion. While copper heat exchangers have higher conductivity to heat which means that they will heat water faster.

1-degree precise temperature control

The ECO 11 tankless water heater comes with 1-degree precise temperature control, which helps in maintaining the desired water temperature at all times.

Self-modulation

A feature that any excellent tankless water heater should have is Self-Modulation. It allows adjusting of power output according to the need.

Hot Water Output

Temperature Rise35°F45°F55°F65°F75°F
Flow rate2.54 GPM1.97 GPM1.61 GPM1.37 GPM1.15GPM

Lifetime Warranty

Ecosmart ECO 11 tankless water heater is backed by a lifetime warranty, which means that you can enjoy its services throughout its lifetime without worrying about any hassles. However, under the condition of installation by a professional.

Certified

CSA certified ETL listed to UL499 and ANSI/NSF lead-free compliance

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Stainless steel is used to construct the heat exchanger.
  • Voltage demand is 240 volts
  • Amperage drawn is 54A
  • 2 wires of 6 AWG cables
  • Single Breakers of 60A
  • Water fittings support ½ CF
  • Operating pressure of 25-150 Psi
  • Activation Flow Rate of 0.3 GPM

Specifications

  • Color: White
  • Weight: 6.5 Pound
  • Dimensions: 11.5H x 8W x 3.75D in inches

Pros

  • Lifetime warranty
  • Stainless steel composition
  • Inexpensive
  • Self-modulation
  • Precise temperature control

Cons

  • Limited power

Why you should buy this?

It is point of use tankless water heater for those who already have an existing water heating system and want to use it as a buffer or if you have limited needs for hot water. This inexpensive unit is a great addition due to its lifetime warranty.


8. Stiebel Eltron Tempra 29 plus Electric Tankless Water Heater

Best Pick

Stiebel Eltron Tankless Water Heater
Stiebel Eltron Tankless Water Heater

Tempra 29 Plus is a tankless water heater designed for colder climates. It offers an impressive flow rate of 6.6 gallons per minute, making it a good choice for larger homes. In addition, it comes with a built-in temperature controller, which ensures accurate temperature regulation.

If a reliable and efficient tankless water heater for a colder climate is what you need, the Tempra 29 Plus is a great choice. It’s capable of delivering plenty of hot water, and it features a temperature controller to help ensure accurate temperature regulation.

Feature

Advance flow control

It comes with advanced flow control. This means that the water flow is constantly monitored and adjusted as needed to ensure a consistent temperature.

Electric ignition

The electric ignition on the Tempra 29 Plus eliminates the need for a pilot light, making it easier to use.

Built-in temperature controller

The Tempra 29 Plus has a built-in temperature controller that allows it to precisely control the output flow and ensure accurate temperature regulation.

Quiet operations

The Tempra 29 Plus operates quietly, so you won’t be disturbed by noise when it’s running.

Self-Modulation

The Tempra 29 Plus is a self-modulating water heater, which means that it will adjust its output to match the needs of your home. So you don’t have to adjust it operational level to ensure higher savings, it does this itself.

Warranty

It also comes with a 7-year leakage and 3-year parts warranty which guarantees that the water heater will be free from defects.

Certified

ETL listed to UL499. Conforms to CSA guidelines, and WQA certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 240 Volt
  • Water connection fittings of 3/4 in. NPT
  • Operating pressure of 30-150 Psi
  • Activation Flow Rate of 0.77 GPM
  • Output power is 28.8K watts
  • Amperage drawn is 120A
  • Requires 3 breakers of 40A each
  • Wiring uses three 8 AWG wires

Specifications

  • Color: Grey Metal
  • Weight: 19 pounds
  • Dimensions: 16.6W x 14.5H x 4.6D in inches

Pros

  • Continuous hot water due to advance flow control
  • Self-modulation
  • Quieter operation
  • Durable construction gives it longer lifespan

Cons

  • High activation flow rate

Why you should buy this?

A great tankless water heater for those who love taking shower but don’t want to get cold water between the hot water showers. It powerful enough to support whole house needs while eliminating all kind of cold water sandwich.


9. Thermomate 18KW Electric Tankless Water Heater

Thermomate 18KW Electric Tankless Water Heater
Thermomate 18KW Electric Tankless Water Heater

It is not a very well know the brand but that does mean its products and not good. Thermomate 18Kw is an amazing example. It got multiple safety mechanisms to combat difficult climates. It also gives higher energy savings due to its energy-efficient design. It is a smaller unit and only acts as a point-of-use tankless water heater.

Feature

Built-in freeze protection

It comes with freeze protection that allows it to withstand even the harshest of climate while ensuring that you get your hot water as you desired.

40% energy savings

With its energy-efficient design, you can expect a 40% reduction in bills as compared to an electric tank water heater.

Overheating Protection

It also comes with overheating protection that ensures that water doesn’t reach a dangerous level of temperature before it reaches you by shutting the unit when water exceeds a certain temperature.

Hot Water Output:

Temperature rise30F45F60F75F
Flow Rate (in GPM)3.62.82.11.7

Warranty

This unit offers a 2-year limited warranty for the unit.

Certified

ETL listed

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Temperature can be adjusted between 80-140 degrees Fahrenheit
  • Voltage demand is 240v
  • Power is 18KW
  • Draws 76 Amp of current
  • Operating pressure is 25-150 Psi
  • Water connections support ¾ in. NPT
  • Requires 2 x 40A DP breakers
  • Uses 2 x 8 AWG wires for electrical connection

Specifications

  • Color: Gray
  • Weight: 21.2 Pounds
  • Dimensions: 17.12H x 13.12W x 3.12D

Pros

  • Freezing protection
  • Overheating protection
  • Self-modulation
  • Anti-Scale design

Cons

  • Warranty period is too small.

Why you should buy this?

A tankless water heater that gives a lot of consideration to a user-friendly unit that is both safe and facing coldest of climates. However its limited warranty does make it a little harder to choose it that’s why it is not as popular as other tankless water heaters in our list.


10. Rheem RTEX-13 Electric Tankless Water Heater

Rheem RTEX-13 Residential Tankless Water Heater
Rheem RTEX-13 Residential Tankless Water Heater

The Rheem RTEX-13 tankless water heater is a wonderful choice if you’re looking for a water heater. Because it’s a Rheem product, you know it’ll last. Its works as a point-of-use tankless water heater for cold climates, which means it’s can only support one or two faucets at the same time. Therefore, it by no means can support all your need if you live in a cold climate.

Plus, it features a durable copper immersion heating element and external adjustable digital thermostatic control with an LED display, making it easy to use, long-lasting, and highly accurate.  So if you’re looking for an efficient and reliable tankless water heater, the Rheem RTEX-13 is a great option.

Features:

+/- 1-degree Adjustable thermostatic control

Rheem Rtex-13 tankless water heaters offer a high level of thermostatic control, making it easy to get the perfect temperature for your needs. This +/- 1-degree adjustment gives you great precision, so you can always be sure that your water is heated exactly the way you want it.

Copper immersion heating element

The copper immersion heating element gives you a durable and responsive performance so your water is always heated at the right temperature with consistency.

Easy installation

Rheem RTEX-13 offers an easy installation, so you can get it up and running quickly and with no issues. State-of-the-art technologies make this unit easy to use, and it always gets things up and running.

Self-modulation

The Rheem RTEX-13 tankless water heater is self-regulating, it adjusts the power usage to meet your demands automatically. This helps to conserve energy and keep your costs low.

Warranty

Rheem gives a 5-year warranty on the heating chamber and a 1-year limited part warranty for this model.

Certified

ETL listed and ANSI/NSF certified against lead-free compliance

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage demand is 240v
  • Power is 13KW
  • Draws 54 Amp of current
  • Operating pressure is 25-150 Psi
  • Water connections support ½ CF
  • Requires a 60A DP breakers
  • Use 6 AWG wire for electrical connection
  • Activation Flow Rate is 0.3 GPM

Specifications

  • Color:Gray Metal
  • Weight:8.5 Pounds
  • Dimensions: 12.6H x 8.25W x 3.6D

Pros

  • Precise 1-degree temperature control
  • Copper heat exchanger makes heats water quicker
  • Easy to set up
  • Auto-modulation

Cons

  • Can only work as point of use in colder climates

Why you should buy this?

It is a user-friendly and reliable tankless water heater. Although it can only work as a point of use in colder climates and support a single outlet, it does its work efficiently. If you have limited hot water needs it is the one to get.


Buyer Guide for best electric tankless water heater for cold climates

Hot water capacity

Incoming water temperature affects the flow rate of tankless water. This means that a tankless water heater may not give as much hot water as it stated that it would. This is because a tankless water heater is limited by its power to bring a certain rise in the temperature of the incoming water from the cold water line. So, the first thing to do while deciding on a tankless water heater is to find out its actual flow rate based upon your situation.

It’s simple to figure out what a tankless water heater’s actual flow rate is. There are only three things to note. The first factor to examine is the temperature of the water entering your property. You can easily find it by placing a thermometer under the water coming from an open fixture for 15-30 seconds. This will let you know the incoming water temperature of your home.

The second thing to do is to calculate your hot water needs in peak hours. Literally, you have to count the maximum number of fixtures open at the same time and then multiple the flow rate of each fixture with its matching flow rate. You can easily find the flow rate of different fixtures on the internet.

The last thing to do would be to check the temperature rise of the tankless model. It is present in the specification sheet of that specific model. Where you can see the temperature rise that the tankless water can give based on the incoming temperature. It will also tell you how much flow rate you can expect from this tankless water heater at various incoming temperatures. Matching these findings with your incoming temperature and needs can give you an exact idea of what flow rate you can get from this tankless water heater.

Frost protection

Still, there are many ways through which you can do frost protection yourself by doing some DIYs. The most common DIY for frost protection is using heat tape around the unit. You can use it around the cold and hot water Outlets as well as around the pipes running through your homes.

Another thing that you can do is to install a recirculation pump, which will circulate the hot water around your home at regular intervals. Bring the cold water of your pipes back to the unit to heat up and after heating, it sends it back to the pipe. So, in this way you can also prevent water from freezing in your pipes.

DesignTankless heater reviewsRetailer
1. Rheem RETEX-36 KW  Electric Tankless Water Heater
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Budget Pick2. Ecosmart ECO-36 KW  Electric Tankless Water Heater
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3. SioGreen SIO 18 Electric Tankless Water Heater (Best for Hard Water problems)
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Staff Pick4. Stiebel Eltron Tempra 24 plus Electric Tankless Water Heater
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5. Atmor 29kW Electric Tankless Water Heater
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6.    Iheat Electric Tankless Water Heater
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7. Ecosmart ECO 11 Electric Tankless Water Heater
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Best Pick8. Stiebel Eltron Tempra 29 plus Electric Tankless Water Heater
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9. Thermomate 18KW Electric Tankless Water Heater
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10. Rheem RTEX-13 Electric Tankless Water Heater
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We recommend for the best electric tankless water heater for cold climates that you purchase Stiebel Eltron Tempra 24 or 29 if you live in a colder region as they come with advanced flow control that allows continuous hot water even if water drawn exceeds that tankless unit capacity. Its advanced flow control will decrease the amount of water you will be getting to ensure that you get continuous and even temperature hot water.


Conclusion

To summarize this article for the best electric tankless water heater for cold climates, there are numerous electric tankless water heaters, which one is the best is determined by your hot water requirements. However bigger tankless unit may not necessarily be best as it may require you to upgrade your electrical service which may cost more than the tankless unit while a smaller one may not be able to fulfill your needs. Hence, the decision on the best tankless water heater depends upon you.


Frequently Asked Questions

Can tankless water heaters be used in cold climates?

Yes, you can use an electric tankless water heater in colder climates. Speaking of fact, most of the bigger sizes tankless water heaters can work in colder climates. But one thing you need to remember is that they don’t specifically come with frost protection. The only got protection around the heating element which is a kind of protection due to the healing properties of the heat exchanger. So, does it mean that you can’t choose an electric tankless water heater in a colder climate? Well, yes, if you are thinking about installing them outdoors, then they are not good for a longer investment. But if you are installing an electric tankless water heater indoors in a place where it is cozier or a place you think that Frost cannot get, they work absolutely fine.

What are the electrical requirements for an electric tankless water heater?

Electric tankless water heaters have different electrical requirements depending on their size. You can find the actual electrical requirements for the unit by consulting its specification sheet or owner manual.

Can I install an electric tankless water heater myself?

Yes, but it’s better to not do so. It is because improper dealing with the electrical panels can be life-threatening and most tankless manufacturers entail the condition of professional installation for the warranty to be valid. In the case of personal installation, it will stand void. It depends upon you whether the unit is cheaper or the professional installation costs are lower to make your decision.

What size breaker do I need for a tankless water heater?

The size of the breaker and their quantity depends upon the tankless unit size, power, or the number of heating elements it uses. You can always consult the product user manual or its specification sheet, which can be found on the internet before you purchase one.


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Emma Johnson
By Emma Johnson

Hi, This is Emma. Author at “BestHeaterGuide.com”. I am a graduate of Mechanical Engineering. Currently researching on heating technology. However, I have learned many home heating techniques and still learning home heating technology. And I love to share my research and reviews.

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